Method of twisting augers



(NoMbdeL) M. HARDSOOG.

METHOD OF TWISTING AUGERS. No. 392,119. Patented Oct. 30, 1888WYT/VESSES [/V'V N707? N. PETERS. Pho\n-lilhngmphur. w ashingmlhllc.

NITE TATES MARTIN HARDSOOG, OF OTTUMWVA, IOWA.

METHOD OF TWISTING AUGERS.

PECIPICATION forming part of Letters Patent No. 392,119, dated October30, 1888,

Application filed March 16, 1888. Serial No. 267,373. (No model.)

To aZZ whom it may concern.-

Be it known that I, MARTIN HARDSOOG, a citizen of the United States, anda resident of Ottumwa, in the county of WVapello and State of Iowa, haveinvented certain new and useful Improvements in the Method of TwistingAngers; and I do hereby declare that the following is a full, clear, andexact description of the invention, which willenableothers skilled intheart to which it appertai-ns to make and use the same, referencebeinghad to the accompanying drawing, which forms a part of thisspecification, and in which is showna side elevation of a machineapplicable for carrying out my improved method of twisting drills,angers, &c.

My invention has relation to an improved method of manufacturing drills,augers, or other twisted metallic bars; and it has for its object toprovide a method whereby the bar for making the drill, anger, or othertwisted object may be twisted evenly and without any strain upon thesame, as will be hereinafter more fully described, and pointed out inthe claims.

The method consists, essentially, in supporting the bar to be twisted atits ends in the devices for holding it and twisting it, and foradmitting one or both of these devices moving inward toward the other,so as to remove the strain upon the bar caused by twisting it,andadmitting of the twisted bar being of the same width and thickness asthe blank bar used for producing the twisted bar.

The machine shown in the drawing is the simplest and most preferableform, and consists of the base-piece or bench 1, upon which are securedtwo uprights,2, at one end and two other movable uprights, 9, at or nearthe other end. The uprights 2 have bearings at their upper ends, inwhich a shaft, 4, is journaled, while another shaft, 11, is journaled inbearings 10 inthe upper ends oftheother uprights,9. The inner end of theshaft 4 is provided with a socket, 5, and the inner end of the shaft 11is provided with a similar socket, 12, and each of the sockets isprovided with a setscrew, 6. These shafts are driven in oppositedirections by means of the belts 8 8, passing around the pulleys 7 7upon them between the uprights.

In operation the bar to be twisted is secured in the sockets, as shownat 17, and the shafts revolved in opposite directions at the same time.As the bar is thus twisted around a central axis,itis graduallyshortened, and the movable supports 9 are drawn toward the sta tionarysupports 2 at the other end of the bench. In this way there will be nodrawing strain upon the bar being twisted, except such as is exerted bythe weight 16 at the end of the chain 14. The chain 14 is secured to theouter end of the shaft 11 and passes over the pulley 15, and is alsoprovided with a swivel-joint, 13, which permits of the portion that isconnected to the shaft to revolve without revolving or twisting theentire chain.

It is obvious that if the auger is twisted at one end only thecylindrical form cannot be maintained, but the auger will taper from therotative shaft toward the fixed point; but when both shafts rotatesimultaneously and with the same speed in opposite directions the augerwill be practically cylindrical. In other words, the perimeter of thetwist from end to end will have the same radii. It is also evident thatby causing both 'ends to be twisted at the same time the auger can beformed in one-half the time it would take if it were twisted from oneend only.

If desired, the carriages or sleds having the revolving shafts may bemoved toward or from each other by means of a screw, 20, which mayeither be turned by hand or operated by suitable gearing to the powerrevolving the shaft. It follows that this form may be either used withone or two sliding carriages.

The sliding support or supports for the bar may be moved by means ofgearing connected to the gearing driving the twisting shaft or shafts,or the draw of the twisting of the bar may be partly counteracted bysprings or any other ordinary means, which it is not necessary toillustrate; but I do not wish to confine myself to any specific form ofmachinery by means of which my method may be carried out, but wish toconfine myself simply to the method of twisting metallic bars betweensupports movable toward each other, the ends of the bars beingsimultaneously twisted in opposite directions.

Having thus described my invention, Iclaim and desire to secure byLetters Patent of the United States- 1. The method of twisting bars fordrills,-

other under an even resistance, substantially as set forth.

In testimony that I claim the foregoing as my 10 own I have hereuntoaffixed my signature in presence of two yitncsses.

)LXRTIN .l l ARDSOCG.

\Vitnesses:

.l'. S. SURBAUH'H, fl. RIORDAN.

